Lathe-chuck



(No Model.)

D. SLATE.

v LATHE CHUCK.

No. 251,305. Patented Dec; 20,1881.

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N. PETERS. PhulrrLilhngmphur. wmm m. o.c

UNITED STATES PATENT OFFICE.

DWIGHT SLATE, OF HARTFORD, ASSIGNOR TO THE E. HORTON AND SON COMPANY, OF WINDSOR LOCKS, CONNECTICUT.

LATHE-CH UCK.

SPECIFICATION forming part of Letters Patent No. 251,305, dated December 20, 1881.

Application filed AugustlB, 1881. (N0 model.) v

To all whom it may concern:

Be it known that I, DWIGHT SLATE, of Hartford, in the county of Hartford and State of Connecticut, have invented a certain new anduseful Improvementin Combination Lathe- Chucks, of which the following is a description, reference being bad to the accompanying drawings, where- Figure 1 is a view of the back of a chuck embodying my improvement. Fig. 2 is aview of same, with disk and springs removed. Fig. 3 is a side view of the disk. Fig. 4 is a view in cross-section on plane denoted by line a: 01:. Fig. 5 is a view in section parallel to the axis of the chuck, and on plane denoted by the dotted line y 3 in Fig. 1.

My improvement relates to that class of combination-chucks--t'. e., those which may be changed from universal to independent, and vice versa-which have an annular gear for engaging with pinions on the various screws which operate thejaws and a loose ring back of the annular gear for use in meshing and unmeshing the annular gear from such pinions. The improvement is a device different from those which have preceded it for causing the meshing and unmeshing of said annular gear and said pinions.

In the accompanying drawings, the letter a denotes one half of a chuck-body made in the ordinary form, and b the other half. The letter 0 denotes thejaws; d, the threaded shafts passing through nuts on the jaws, bearing pinions e, and having the outer end squared for the application of a wrench. Back of the pin ions, in a groove in chuck -'body half I), are placed an annular gear, f, and loose ring 9. The ring 9 has in its lower surface a number of recesses, It, corresponding in number, shape, and relative position to cams h, which may be cast on the half I). In a radial slot, i, in the ring 9 a crank-pin, 7c, appurtenant to the crank-disk I, moves freely when the disk is rotated. The disk lis placed in aseat, m, in the half I), and a semicircular slot, it, through the bottom of the seat, allows the pin it to move freely fora halfturn of the disk. The disk is operated by a thumb-piece, l, or similar device, and it is held in position by springs 0 o fastened to half I).

When the loose ring is pressed forward by the interposition of the cams h the annular gear is thrown into mesh with the pinions c and the chuck is set as universal-that is, by turning any one of the shafts all are turned and the jaws move simultaneously.

In order to change the chuck to the independent form the annular gear and the pinions must be thrown out of mesh, and this is accomplished by my improved device in the following manner: By means of the thumbpiece l the crank-disk l is rotated in its seat a half-turn,moving, by the appurtenant crankpin it, which passes through slot at and into the radial slot 6, the loose ring g a distance sufficient to bring the cams h and recesses h directly opposite each other. The loose ring and the annular gear now may be slipped back a distance equal to the thickness of the cam and the pinions and gear thrown out of mesh.

The crank-disk is held in position by the springs 0, and this, together with the peculiar combination of the crank-pin and radial slot, holds the disk at both limits of its play, and with it the loose ring, against rotation by jars or from ordinary use of the chuck, and at the same time permits the change of the chuck from the independent to the universal form, or vice versa, by the simple and single turning of the crank-disk.

The crank-disk can be held from turning by various devices, as a screw, with half the head cut away and the remainder used as a button; but the spring is preferred.

A part of myimprovement consists in using that peculiarity ofacrank-motion the deadccnter--as a locking device against rotation of the loose ring by stopping the rotation of the crankdisk (when the chuck is set) with the pin it and the center in theline of rotation of the loose ring.

I claim as my invention- In a combination-chuck,the combination of the annular gear f, the loose ring g, provided with the recesses h and radial slot t, the chuck-body half b, provided with the cams h and parti-eircular slot 4%, and the disk 1, proand parti-circular slot n, the disk I, provided vided with operating button and crank-pin, with operating-button and crank-pin, and the 10 all substantially as described, and for the pursprings 0, all substantially as described.

pose set forth. 5 2. In a combinatiou-ohuck,the combination DWIGHT SLA'lE' of the annular gear f, the loose ring g, pro- Witnesses: Vided with the recesses h and radial slot 1;, the CHAS. L. BURDETT, chuck-body half b, provided with the cams h W. MARSH. 

